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This genus is recognised by the flat
head and large eyes that are set latterly on the head and their
heavy body armour. The ventral region is also armored and you
can sometimes identify a species by the pattern on the underbelly.
In saying that the species in this genus are notoriously difficult
to identify and most of the time you would need the location of
the catchment area or even down to the river itself to pinpoint
a certain species. Vertebrae: 28 - 27. This species is distinguished
from its congeners by the presence of an elongated dark spot along
the middle caudal-fin branched rays, not involving the lanceolate
plates at the base of the fin; the spot is typically extended
over equal number of upper- and lower-lobe branched rays and along
more than two thirds of the ray length. Sexual Differences:
Male urogenital papilla short and conical, covered by anterior
flaplike anus. Males with patch of tightly arranged small odontodes,
variably covering first to fourth plates of ventral series, lateral
to urogenital papilla. Males with poorly developed soft-tissue
flap along posterior margin of pelvic spine. Female anus tubular,
without separate urogenital papilla. In females, size and arrangement
of odontodes on plates lateral to anus similar to adjacent plates,
without distinct patch of differentially arranged odontodes. Female
pelvic spine without flap of soft tissue on posterior surface.